deps: update google auth library dependencies to v1.26.0 (#3216)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[com.google.auth:google-auth-library-credentials](https://github.com/googleapis/google-auth-library-java)
| `1.25.0` -> `1.26.0` |
[![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.auth:google-auth-library-credentials/1.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.auth:google-auth-library-credentials/1.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.auth:google-auth-library-credentials/1.25.0/1.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.auth:google-auth-library-credentials/1.25.0/1.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
|
[com.google.auth:google-auth-library-oauth2-http](https://github.com/googleapis/google-auth-library-java)
| `1.25.0` -> `1.26.0` |
[![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.auth:google-auth-library-oauth2-http/1.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.auth:google-auth-library-oauth2-http/1.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.auth:google-auth-library-oauth2-http/1.25.0/1.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.auth:google-auth-library-oauth2-http/1.25.0/1.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
|
[com.google.auth:google-auth-library-bom](https://github.com/googleapis/google-auth-library-java)
| `1.25.0` -> `1.26.0` |
[![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.auth:google-auth-library-bom/1.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.auth:google-auth-library-bom/1.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.auth:google-auth-library-bom/1.25.0/1.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.auth:google-auth-library-bom/1.25.0/1.26.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### Release Notes

<details>
<summary>googleapis/google-auth-library-java
(com.google.auth:google-auth-library-credentials)</summary>

###
[`v1.26.0`](https://github.com/googleapis/google-auth-library-java/blob/HEAD/CHANGELOG.md#1260-2024-09-18)

[Compare
Source](https://github.com/googleapis/google-auth-library-java/compare/v1.25.0...v1.26.0)

##### Features

- Updates UserAuthorizer to support retrieving token response directly
with different client auth types
([#&#8203;1486](https://github.com/googleapis/google-auth-library-java/issues/1486))
([1651006](https://github.com/googleapis/google-auth-library-java/commit/16510064e861868f649b6bc8fdc54b8a39890812))

</details>

---

### Configuration

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Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about these
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---

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---

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View the [repository job
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gapic-generator-java-pom-parent/pom.xml

@@ -27,7 +27,7 @@
         consistent across modules in this repository -->
     <javax.annotation-api.version>1.3.2</javax.annotation-api.version>
     <grpc.version>1.66.0</grpc.version>
-    <google.auth.version>1.25.0</google.auth.version>
+    <google.auth.version>1.26.0</google.auth.version>
     <google.http-client.version>1.45.0</google.http-client.version>
     <gson.version>2.11.0</gson.version>
     <guava.version>33.3.0-jre</guava.version>

gax-java/dependencies.properties

@@ -37,8 +37,8 @@ version.io_grpc=1.66.0
 #   2) Replace all characters which are neither alphabetic nor digits with the underscore ('_') character
 maven.com_google_api_grpc_proto_google_common_protos=com.google.api.grpc:proto-google-common-protos:2.44.0
 maven.com_google_api_grpc_grpc_google_common_protos=com.google.api.grpc:grpc-google-common-protos:2.44.0
-maven.com_google_auth_google_auth_library_oauth2_http=com.google.auth:google-auth-library-oauth2-http:1.25.0
-maven.com_google_auth_google_auth_library_credentials=com.google.auth:google-auth-library-credentials:1.25.0
+maven.com_google_auth_google_auth_library_oauth2_http=com.google.auth:google-auth-library-oauth2-http:1.26.0
+maven.com_google_auth_google_auth_library_credentials=com.google.auth:google-auth-library-credentials:1.26.0
 maven.io_opentelemetry_opentelemetry_api=io.opentelemetry:opentelemetry-api:1.42.1
 maven.io_opencensus_opencensus_api=io.opencensus:opencensus-api:0.31.1
 maven.io_opencensus_opencensus_contrib_grpc_metrics=io.opencensus:opencensus-contrib-grpc-metrics:0.31.1